Lecithin is a fat that is essential in the cells of the body.  It can be found in many foods, including soybeans and egg yolks.  Lecithin is taken as a medicine and is also used in the manufacturing of medicines.

Lecithin is a phospholipid composed of phosphatidyl esters (phosphatides), mainly consisting of phosphatidyl choline, phosphatidyl ethanolamine, and phosphatidyl inositol.  Lecithin also contains fatty acids, which are primarily omega-6 fatty acids and a small amount of omega-3 fatty acids.

Phospholipids are the major component in the membranes of the brain which perform the essential functions of cellular communication and hormonal signal transduction.

Nerve cells, in particular, depend on healthy membrane function for normal neurotransmitter metabolism and nerve signal transmission.  Choline is used for synthesis and maintenance of normal cell membranes.  Taking lecithin orally may increase serum choline, a precursor to the acetylcholine which supports memory.

In addition, lecithin can play a key role in the emulsification and mobilization of fats and cholesterol.

Lecithin has Generally Recognized as Safe (GRAS) status in the US.‡